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Analog Devices Inc. LTC7149IFE#TRPBF
- Part No.:
- LTC7149IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7149IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,899
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Product details
Overview
LTC7149IFE#TRPBF from Analog Devices is a 60V, 4A synchronous monolithic step-down regulator configured for inverting output applications, delivering –28V to 0V output with ±0.8% voltage accuracy, 92% efficiency at 12VIN/–5VOUT, and peak current mode control. It integrates 110mΩ top/50mΩ bottom N-channel MOSFETs and supports programmable switching frequency (300kHz–3MHz) via external RT resistor.
For engineers reviewing the LTC7149IFE#TRPBF datasheet, LTC7149IFE#TRPBF pinout, LTC7149IFE#TRPBF application, or LTC7149IFE#TRPBF equivalent, key selection considerations include its board-ground-referenced I/O pins (RUN, MODE/SYNC, PGOOD), single-resistor VOUT programming via ISET, Burst Mode® vs forced continuous mode trade-offs, and thermal performance in the 28-lead TSSOP package with exposed SVOUT– pad.
Technical Context
The LTC7149IFE#TRPBF implements a peak current mode architecture with internal level-shifted I/O, enabling direct board GND referencing for RUN, MODE/SYNC, and PGOOD despite negative output operation. Its error amplifier uses ISET as positive input and VOUTSNS as negative input, with 50µA reference current setting VOUT– = –50µA × RSET.
Switching frequency is set by RT-to-SVOUT– resistor (300kHz–3MHz, ±50% sync range), while MODE/SYNC selects Burst Mode (440µA quiescent current) or forced continuous mode (low ripple). Input voltage regulation (VINREG) and overvoltage lockout (64V threshold) provide system-level protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 60V - supports wide industrial and telecom input rails without external pre-regulation |
| Output Voltage Range | –28V to 0V - enables negative bias generation for op-amps, ADCs, and RF stages |
| Max Output Current | 4A inductor current - delivers full load into –5V with 92% efficiency at 12VIN |
| Output Voltage Accuracy | ±0.8% - ensures precise negative rail regulation across temperature and line/load |
| Quiescent Current | 440µA in Burst Mode - extends battery life in low-power standby states |
| Switching Frequency | 300kHz to 3MHz - adjustable via RT resistor; ±50% external sync range for EMI control |
| Package | 28-Lead Plastic TSSOP - thermally enhanced with exposed SVOUT– pad soldered to PCB ground plane |
Pinout & Package
Package: 28-Lead Plastic TSSOP (4mm × 5mm footprint, exposed SVOUT– thermal pad on underside).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT– (Pins 1–5) | Negative output return | Primary power return node; all internal references tied to this potential |
| VIN (Pins 6,7) | Input supply input | Accepts 3.4V–60V; powers internal LDOs and high-side driver |
| RUN (Pin 8) | Enable control input | Logic-high threshold 1.2V; resistor divider from VIN sets accurate undervoltage turn-on |
| GND (Pin 9) | Board ground sense | Provides local ground reference for internal circuitry and level-shifting |
| MODE/SYNC (Pin 10) | Operating mode select | GND = Burst Mode; floating = forced continuous; external clock = sync mode |
| PGOOD (Pin 11) | Power-good indicator | Open-drain output pulled low when VPGDFB < 0.555V or > 0.645V relative to VOUT– |
| PGDFB (Pin 12) | Feedback for PGOOD | Resistor divider from GND to VOUT– sets PGOOD trip thresholds |
| VINREG (Pin 14) | Input voltage regulation sense | Programs input undervoltage limit; tie to INTVCC to disable |
| RT (Pin 15) | Oscillator frequency set | Resistor to SVOUT– programs fSW; 100kΩ yields ~1MHz |
| VOUTSNS (Pin 16) | Error amp negative input | Tied to GND in standard config; enables tracking or remote sensing |
| ISET (Pin 17) | Output voltage programming | 50µA sink; RSET to VOUT– sets VOUT– = –50µA × RSET |
| ITH (Pin 18) | Error amp output/compensation | Voltage controls peak inductor current; tie to INTVCC for internal compensation |
| EXTVCC (Pin 19) | External LDO input | Reduces power loss when >3.2V above VOUT–; tie to GND for –3.3V or lower outputs |
| INTVCC (Pin 20) | Internal LDO output | 3.3V above VOUT–; bypass with ≥2.2µF ceramic to VOUT– |
| BOOST (Pin 21) | High-side gate driver supply | Bootstrap capacitor (0.1µF) between BOOST and SW enables N-MOSFET drive |
| SW (Pins 22–28) | Switch node | Connects to inductor; carries high di/dt square wave; requires tight layout |
| SVOUT– (Pins 13,29) | Exposed thermal pad | Mandatory solder connection to PCB copper plane for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Board GND-referenced I/O | RUN, MODE/SYNC, and PGOOD operate referenced to PCB ground - eliminates need for level shifters in negative-rail systems |
| Single-resistor VOUT programming | ISET pin sinks precise 50µA - output voltage set by one external resistor (VOUT– = –50µA × RSET) |
| Programmable soft-start | Capacitor from ISET to VOUT– controls ramp rate - prevents inrush current during startup into pre-biased loads |
| Accurate input voltage regulation | VINREG pin senses input droop - reduces peak inductor current when VIN falls below programmed threshold |
| Integrated MOSFETs | 110mΩ high-side + 50mΩ low-side N-channel switches - eliminates external FETs and gate drivers |
Applications
| Industrial Process Control | Telecom Line Card Power |
|---|---|
Use Scenario: Generating –15V bias for precision instrumentation amplifiers and analog front-ends in PLC modules. IC Role / Device Role / Timing Role: Inverting buck regulator providing stable negative rail with low noise and high PSRR. Use Value: ±0.8% output accuracy and 92% efficiency at 12VIN/–5VOUT ensure signal integrity and thermal management in dense enclosures. | Use Scenario: Supplying –48V intermediate bus for optical transceiver bias in 4G/5G base station line cards. IC Role / Device Role / Timing Role: High-voltage inverting regulator stepping down 54V telecom input to –28V auxiliary rail. Use Value: 60V input rating and 4A capability support transient-heavy telecom environments without derating. |
| Distributed Power Systems | Test & Measurement Equipment |
Use Scenario: Local –12V generation for ADC reference buffers and DAC output stages in modular data acquisition systems. IC Role / Device Role / Timing Role: Compact, self-contained inverting regulator replacing discrete charge-pump or transformer-based solutions. Use Value: Integrated MOSFETs and single-resistor programming reduce BOM count and layout area versus multi-chip alternatives. | Use Scenario: Programmable negative supply for oscilloscope vertical deflection amplifiers requiring fast transient response. IC Role / Device Role / Timing Role: Peak current mode controller with 60ns minimum on-time enabling stable operation at high duty cycles. Use Value: Fast transient response and Burst Mode® operation maintain regulation during dynamic load steps while minimizing idle power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7151SIFE#TRPBF | Higher 80V input rating; 5A output; integrated compensation; no ISET programming (uses resistor divider on VOUTSNS) | Requires different feedback network; better suited for higher input voltage or current demands | Select when >60V input or >4A output is required; not drop-in due to different VOUT programming method |
| TPS543B20RTWT | 36V max input; 3A output; uses external VFB resistor divider; no native negative output configuration | Requires external inverting topology (e.g., Ćuk or inverting buck-boost); lacks integrated negative-rail features | Consider only with external inverter stage; inferior integration and thermal performance for dedicated negative rail use |
Compared with LTC7151SIFE#TRPBF and TPS543B20RTWT, the LTC7149IFE#TRPBF offers unique single-resistor negative output programming, board-ground-referenced I/O, and optimized thermal design for TSSOP-packaged inverting applications - making it the most integrated solution for –28V/4A requirements within its 60V input envelope.
Availability
LTC7149IFE#TRPBF is available at Aetrix Electronics and suitable for industrial process control, telecom line card power, and distributed power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC7149IFE#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7149 belongs to ADI's Power by Linear™ monolithic DC/DC regulator family, designed specifically for high-efficiency, high-voltage inverting and buck applications where compact size, thermal robustness, and precise negative rail generation are critical.
FAQ
What is the maximum input voltage rating for the LTC7149IFE#TRPBF?
The LTC7149IFE#TRPBF has an absolute maximum input voltage rating of 64V, with a recommended operating range of 3.4V to 60V. Exceeding 60V may trigger VIN overvoltage lockout (64V threshold), suspending switching until VIN drops below 62V. This rating enables compatibility with 48V telecom and industrial bus systems while maintaining safety margin.
How is the output voltage programmed on the LTC7149IFE#TRPBF?
The LTC7149IFE#TRPBF uses a precise 50µA current sink on the ISET pin to program VOUT– = –50µA × RSET, where RSET connects from ISET to VOUT–. For example, a 100kΩ resistor sets –5V output. This single-resistor method eliminates feedback dividers and simplifies design versus traditional VFB-based regulators.
Does the LTC7149IFE#TRPBF support synchronization to an external clock?
Yes, the LTC7149IFE#TRPBF supports external clock synchronization via the MODE/SYNC pin. When driven by an external clock, the internal oscillator locks within ±50% of the programmed RT-set frequency. Proper RT selection is required to ensure the external clock falls within this capture range for reliable synchronization.
What thermal considerations apply to the LTC7149IFE#TRPBF in TSSOP package?
The LTC7149IFE#TRPBF's 28-lead TSSOP package features an exposed SVOUT– pad (Pin 29) that must be soldered to a PCB copper plane for thermal conduction. With θJA = 30°C/W, adequate copper area and vias to internal ground planes are essential to maintain junction temperature ≤125°C under 4A load, especially at high input-output differentials.
Can the LTC7149IFE#TRPBF operate with a pre-biased output?
Yes, the LTC7149IFE#TRPBF supports startup into a pre-biased VOUT–. It remains in Burst Mode and keeps power switches off until the ISET voltage ramps up to match VOUTSNS, then begins controlled switching. This prevents reverse current flow and ensures safe, monotonic startup without output voltage overshoot.
LTC7149IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Negative
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0V
- Voltage - Output (Max):
- -28V
- Current - Output:
- 4A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LTC7149IFE#TRPBF FAQ
1.How can I place an order for LTC7149IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7149IFE#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC7149IFE#TRPBF reliable?
The price and inventory of LTC7149IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7149IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7149IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7149IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7149IFE#TRPBF?
LTC7149IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7149IFE#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC7149IFE#TRPBF?
For technical support, including LTC7149IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7149IFE#TRPBF requirements.
6.How does Aetrix verify that LTC7149IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7149IFE#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC7149IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7149IFE#TRPBF?
All LTC7149IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7149IFE#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC7149IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7149IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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